1- Calculate the mass of NaOH which is required to prepare 0.1 M in 250 cm3 aqueous solution (molar mass = 40 gm/mole) 2- Calculate the mass of HCl which is required to prepare 0.1 N in 500 ml aqueous solution. (molar mass = 36.5 gm/mole) 3- 10 gm KCl dissolved in 400 cm3 aqueous solution. Calculate the molarity and molality of the solution. (molar mass, KCl = 74.5 gm/mole – density of the solution = 1.1 gm/ cm3 ). PROBLEMS 4) Calculate the molality of a sulfuric acid solution containing 24.4 g of sulfuric acid in 198 g of water. The molar mass of sulfuric acid is 98.09 g. 5) The density of a 2.45 M aqueous solution of methanol (CH3OH) is 0.976 g/mL. What is the molality of the solution? The molar mass of methanol is 32.04 g. 6) Calculate the molality of a 35.4 percent (by mass) aqueous solution of phosphoric acid (H3PO4 ). The molar mass of phosphoric acid is 97.99 g 7) A solution containing 53 g of sodium carbonate (mol mass = 106) in 1 Kg water at 20°C. The density of the solution at this temperature is 1.1 g/ml. Determine for the solution. 1) the mole fraction of each component 1) the mass percent 2) the molarity 3) the molality 4) the normality.
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